This will be a two part study. In Single Arm Part, patients will receive 11 μg/m2 of SPI-1620 IV followed by docetaxel 75 mg/m2 IV. Cycles will continue every 3 weeks until progression or intolerable toxicity. Overall 27 patients will be enrolled in the Single Arm Part. If 6 or more responses (CR/PR) are observed in this group then the Randomized Part will be initiated.